Trees
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Due Mar 16, 3:59 AM EDT
Which of the following graphs are trees?
Yes, this is a tree, even though it doesn't branch.
Yes, this is a typical tree.
Let vertex r be the root vertex of this tree. Which vertex is then the parent of vertex b.

Exactly. Vertex c is the next vertex after b on the path to the root.
A tree has 10 vertices. How many edges does it have?
The number of edges in a tree is the number of vertices minus 1.